Nonaqueous electrolyte secondary battery insulating porous layer and nonaqueous electrolyte secondary battery laminated separator

Abstract

Provided as a nonaqueous electrolyte secondary battery insulating porous layer that allows a nonaqueous electrolyte secondary battery to have an improved discharge output characteristic is a nonaqueous electrolyte secondary battery insulating porous layer containing fine particles of a metal salt having a Lewis acid peak area within a range of not less than 0.2 g−1 and not more than 3.6 g−1 per unit weight, the Lewis acid peak area being measured by an infrared spectroscopy-based acid nature evaluation method for a solid surface, the Lewis acid peak area of a metal salt per unit weight being defined as a value resulting from dividing (i) the area of a peak present in a region of 1447 cm−3 to 1460 cm−1 of an infrared absorption spectrum measured of a sample on which pyridine was adsorbed and from which the pyridine has then been desorbed by (ii) the weight of the metal salt.

Description

[0001]This Nonprovisional application claims priority under 35 U.S.C. §119 on Patent Application No. 2015-232154 filed in Japan on Nov. 27, 2015, the entire contents of which are hereby incorporated by reference.TECHNICAL FIELD[0002]The present invention relates to an insulating porous layer for a nonaqueous electrolyte secondary battery (hereinafter referred to as “nonaqueous electrolyte secondary battery insulating porous layer”) and a laminated separator for a nonaqueous electrolyte secondary battery (hereinafter referred to as “nonaqueous electrolyte secondary battery laminated separator”).BACKGROUND ART[0003]Nonaqueous electrolyte secondary batteries, particularly lithium secondary batteries, have high energy density and are thus in wide use as batteries for personal computers, mobile telephones, portable information terminals, and the like.[0004]Nonaqueous electrolyte secondary batteries, typically lithium secondary batteries, have high energy density. Nonaqueous electrolyte s...

AI Technical Summary

Benefits of technology

The present invention provides a nonaqueous electrolyte secondary battery separator and nonaqueous electrolyte secondary battery laminated separator that can improve the discharge output characteristic of a nonaqueous electrolyte secondary battery. This results in a superior discharge output characteristic compared to conventional nonaqueous electrolyte secondary batteries.

Problems solved by technology

Nonaqueous electrolyte secondary batteries let a large current flow and thus generate intense heat in the event of an accident such as a breakage of the battery or a breakage of the device using the battery has caused an internal short circuit or external short circuit.

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